Remove all frameworks except Bootstrap (#251)

- Remove all frameworks except Bootstrap

- Remove roots-options.php and replace with a more simple
  roots-config.php

- Include all Bootstrap Javascript plugins by default in
  js/plugins.js

- Use Bootstrap Responsive and Topbar navigation by default

- Use Bootstrap markup on forms, page titles, image galleries,
  alerts and errors, post and comment navigation

- Remove Roots styles from style.css and introduce app.css for
  site-specific CSS. Remove almost all previous default Roots
  styles.

- Add latest updates from H5BP project

css/less/progress-bars.less

@@ -0,0 +1,95 @@
+// PROGRESS BARS
+// -------------
+
+
+// ANIMATIONS
+// ----------
+
+// Webkit
+@-webkit-keyframes progress-bar-stripes {
+  from  { background-position: 0 0; }
+  to    { background-position: 40px 0; }
+}
+
+// Firefox
+@-moz-keyframes progress-bar-stripes {
+  from  { background-position: 0 0; }
+  to    { background-position: 40px 0; }
+}
+
+// Spec
+@keyframes progress-bar-stripes {
+  from  { background-position: 0 0; }
+  to    { background-position: 40px 0; }
+}
+
+
+
+// THE BARS
+// --------
+
+// Outer container
+.progress {
+  overflow: hidden;
+  height: 18px;
+  margin-bottom: 18px;
+  #gradient > .vertical(#f5f5f5, #f9f9f9);
+  .box-shadow(inset 0 1px 2px rgba(0,0,0,.1));
+  .border-radius(4px);
+}
+
+// Bar of progress
+.progress .bar {
+  width: 0%;
+  height: 18px;
+  color: @white;
+  font-size: 12px;
+  text-align: center;
+  text-shadow: 0 -1px 0 rgba(0,0,0,.25);
+  #gradient > .vertical(#149bdf, #0480be);
+  .box-shadow(inset 0 -1px 0 rgba(0,0,0,.15));
+  .box-sizing(border-box);
+  .transition(width .6s ease);
+}
+
+// Striped bars
+.progress-striped .bar {
+  #gradient > .striped(#62c462);
+  .background-size(40px 40px);
+}
+
+// Call animation for the active one
+.progress.active .bar {
+  -webkit-animation: progress-bar-stripes 2s linear infinite;
+     -moz-animation: progress-bar-stripes 2s linear infinite;
+          animation: progress-bar-stripes 2s linear infinite;
+}
+
+
+
+// COLORS
+// ------
+
+// Danger (red)
+.progress-danger .bar {
+  #gradient > .vertical(#ee5f5b, #c43c35);
+}
+.progress-danger.progress-striped .bar {
+  #gradient > .striped(#ee5f5b);
+}
+
+// Success (green)
+.progress-success .bar {
+  #gradient > .vertical(#62c462, #57a957);
+}
+.progress-success.progress-striped .bar {
+  #gradient > .striped(#62c462);
+}
+
+// Info (teal)
+.progress-info .bar {
+  #gradient > .vertical(#5bc0de, #339bb9);
+}
+.progress-info.progress-striped .bar {
+  #gradient > .striped(#5bc0de);
+}